c++实验3类和对象

 实 验 3:

part 1：验证

part 2：graph

#include <iostream>
#include "graph.h"
using namespace std;

int main() {
    Graph graph1('*',);
    graph1.draw();

    system("pause");
    system("cls");

    Graph graph2('$',);
    graph2.draw();
    system("pause");

    return ;
} 

main.cpp

// 类graph的实现

#include "graph.h"
#include <iostream>
using namespace std;

// 带参数的构造函数的实现
Graph::Graph(char ch, int n): symbol(ch), size(n) {
}

// 成员函数draw()的实现
// 功能：绘制size行，显示字符为symbol的指定图形样式
void Graph::draw() {
 for(int i=;i<=size;i++)
 {for(int j=;j<=size-i;j++)
     cout<<" ";
  for(int k=;k<*i-;k++)
     cout<<symbol;
  cout<<endl;
 }
}

graph.cpp

#ifndef GRAPH_H
#define GRAPH_H

// 类Graph的声明
class Graph {
    public:
        Graph(char ch, int n);   // 带有参数的构造函数
        void draw();     // 绘制图形
    private:
        char symbol;
        int size;
};

#endif

graph.h

运行结果：

part 3：分数的加减乘除

#ifndef Fraction_H
#define Fraction_H
// 类Fraction的声明
class Fraction {
    public:
        Fraction(int t=, int b=):top(t),bottom(b){
        }// 带有参数的构造函数
        void add(Fraction a, Fraction b);
        void sub(Fraction a, Fraction b);
        void mul(Fraction a, Fraction b);
        void div(Fraction a, Fraction b);
        void compare(Fraction a, Fraction b);
        void show();
    private:
        int top;
        int bottom;
};

#endif

fraction.h

#include <iostream>
#include "fraction.h"
using namespace std;
int main()
{int x,y,m,n;
 Fraction a;
 a.show();
 Fraction b(,);
 b.show();
 Fraction c();
 c.show();
 cout<<"Input two score: "<<endl;
 cin>>x>>y;
 cin>>m>>n;
 while(y==||n==)
   {cout<<"ERROR!Please try again!"<<endl;
    cin>>x>>y;
    cin>>m>>n;
   }
 Fraction d(x,y);
 Fraction e(m,n);
 a.add(d,e);
 a.sub(d,e);
 a.mul(d,e);
 a.div(d,e);
 a.compare(d,e);
 return ;
}

main.cpp

#include"fraction.h"
#include<iostream>
using namespace std;
void Fraction::show(){
    if (top == ) cout << <<endl;
    else if (bottom == ) cout << top << endl;
    else cout << top << "/" << bottom << endl;
}
void Fraction::add(Fraction a, Fraction b){
    int gbs,m=a.bottom,n=b.bottom,t,r,fz,fm;
    if(m<n)
    {t=m;m=n;n=t;}
    r=m%n;
    while(r!=)
    {m=n;n=r;r=m%n;}
    gbs=a.bottom*b.bottom/n;
    fz=a.top*(gbs/a.bottom)+b.top*(gbs/b.bottom);
    fm=gbs;
    cout<<"add: "<<fz<<"/"<<fm<<endl;
}
void Fraction::sub(Fraction a, Fraction b){
    int gbs,m=a.bottom,n=b.bottom,t,r,fz,fm;
    if(m<n)
    {t=m;m=n;n=t;}
    r=m%n;
    while(r!=)
    {m=n;n=r;r=m%n;}
    gbs=a.bottom*b.bottom/n;
    fz=a.top*(gbs/a.bottom)-b.top*(gbs/b.bottom);
    fm=gbs;
    cout<<"sub: "<<fz<<"/"<<fm<<endl;
}
void Fraction::mul(Fraction a, Fraction b){
    int fz,fm;
    fz=a.top*b.top;
    fm=a.bottom*b.bottom;
    cout<<"mul: "<<fz<<"/"<<fm<<endl;
}
void Fraction::div(Fraction a, Fraction b){
    int fz,fm;
    fz=a.top*b.bottom;
    fm=b.top*a.bottom;
    cout<<"div: "<<fz<<"/"<<fm<<endl;
}

void Fraction::compare(Fraction a, Fraction b){
    int gbs,m=a.bottom,n=b.bottom,t,r,fz,fm;
    if(m<n)
    {t=m;m=n;n=t;}
    r=m%n;
    while(r!=)
    {m=n;n=r;r=m%n;}
    gbs=a.bottom*b.bottom/n;
    fz=a.top*(gbs/a.bottom)-b.top*(gbs/b.bottom);
    if(fz<)
      cout<<"compare: "<<a.top<<"/"<<a.bottom<<"<"<<b.top<<"/"<<b.bottom<<endl;
    else if(fz>)
            cout<<"compare: "<<a.top<<"/"<<a.bottom<<">"<<b.top<<"/"<<b.bottom<<endl;
         else
            cout<<"compare: "<<a.top<<"/"<<a.bottom<<"="<<b.top<<"/"<<b.bottom<<endl;
}

fraction.cpp

运行结果：

总结：

1、part3中有许多代码是重复的，目前还想不到好的解决方案。

2、在做题时，还是会翻阅书，参考样例，不够熟练。

3、学习了用项目。

评论：

1、https://www.cnblogs.com/shenqidetao/p/10742384.html

2、https://www.cnblogs.com/qsxsc/p/10742704.html

3、https://www.cnblogs.com/csc13813017371/p/10743961.html